/* 旋转 */
@keyframes rotate {
  from { transform: rotate(0deg) }
  to { transform: rotate(360deg) }
}
/* 顺时针选择 360 */
@keyframes rotateAlong360 {
  100% { transform: rotate(360deg); }
}
/* 逆时针选择 360 */
@keyframes rotateAgainst360 {
  100% {
    transform: rotate(-360deg);
  }
}

